An Important Point About the Agent-Host-Environment Model (The Epidemiologic Triangle)

question 18

Multiple Choice

An important point about the agent-host-environment model (the epidemiologic triangle) of epidemiologic investigation is that:

• A) the agent is not as important a factor in disease causality as the host or the environment.
• B) the etiology of infectious disease involves more complex multivariate causality as well.
• C) it is necessary that the agent be linked to both the host and the environment and that the agent is present in every case of the disease.
• D) in order to prove causality, which is a difficult task, the researcher must prove that the agent, host, and environmental factors under investigation are both necessary and sufficient to cause the disease being studied.

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